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Extend your boat usage during late fall and early spring with these small and highly efficient marine bilge heaters. Designed to fit in the smallest package possible, the Xtreme Heater helps extend battery life and keeps your boat's critical components warm and dry. Self-regulating forced air provides more accurate climate control for cost saving efficient use of energy. Automatic thermostat turns heater on at 40°F and off at 52°F. Resettable thermal overload protection prevents overheating. Fully anodized inside and out for superior protection from the elements. Prewired for ease of installation. Full one-year warranty.

I purchased this to protect my boat motor from freezing temperatures when stored on a boat lift on a lake in Georgia, during the winter off season. It's automatic so I could leave the boat unattended for months at a time at my summer home. It worked great and paid for itself in one season in haul out/winterizing/labor costs. The real surprise was my canvas lift cover finally failed and allowed the spring rain to flood my engine compartment enough to have the unit submerged for weeks until my return. I drained the water floated the boat and ran around the lake for a few days. When dry, I tested it in my house freezer, and viola! Worked first time perfectly! Absolutely incredible USA quality!

The fan on mine started slow then screeched loudly as it spun up. Maybe it had been sitting for months before it was shipped out for use, but it doesn't give me confidence it will work when heat is called for.

I could see 4-5 years down the road doing something like that, but for the price these things go for, it should be 100% when it's new out of the box.